Rock-drill.



PATENTED PEB. 14, 1905.

R. TEMPLE.

ROCK DRILL.

APPLIUATIoN FILED nro. 1s. 190s.

UNITED STATES Patented February 14, 1905.

PATENT OEEICE.

ROBERT TEMPLE, OF DENVER, COLORADO. ASSIGNOR TOv THE TEMPLE GAS ENGINE &MACHINE COMPANY, OF DENVER, COLORADO, A COR- PORATION OF COLORADO.

`I-"KOCK--DRILLl y SPECIFICATION forming part of Letters Patent No.782,429, dated February 14, 1905.

Application filed December'l, 1903. Serial No. 185302.

To all whom it muy concern:

Be it known that I, ROBERT TEMPLE, a citizen of the United States,residing at Denver, in the county of Denver and State of Colorado,

have invented certain new and useful Improvements in Rock-Drills, ofwhich the following is a specification.

This invention relates to that class of rockdrills which are adapted tobe used in connecio tion with uid under pressure, such as air or steam,for the purpose of-reciprocating and rotating the drill proper, and isintended to be used in connection with the type of rock-drillillustrated in an application for Letters Patent of the United States,Serial No. 168,951,

liled by' me August 10, 1903.

The principal object of the invention is to provide a rock-drill withsimple, economical, and efcient mechanism for rotating` the drill 2Oproper.

Other and further objects of the invention will appear from anexamination of the drawings andthe following description and claims.

Theinvention consists principally in a rockdrill of the type referred toin which there are combined a cylinder portion, a piston reciprocatinglymounted therein, a rifled nut in said piston, a riied bar in engagementwith said nut and provided with a face-,ratchetat the outer end, and asecond face-ratchet in engagement therewith to rotate the piston in astep-by-step manner by and during the reciprocations thereof.

The invention consists,'further and finally, in the features,combinations, and details of construction hereinafter described 'andclaimed. y

In the accompanying drawings, Figure 1 is a longitudinal sectionalelevation of`a cylin- 40 derandpiston portion of one type ofrockdrilling machine constructed in accordance and fitted with theseimprovements; Fig. 2, an end view of the cylinder shown in Fig. 1; Fig.3, an end view of the riiied bar with its face-ratchet, and Fig. 4 anend view of the friction ratchet hereinafter more fully described.

In the art to which this invention relates it is well known that it ishighlydesirable to provide some simple and efficient mechanism by whichthe rock-drill proper may be rotated in a step-bylstep manner at the endof eachI reciprocating cycle, all of which will more fully hereinafterappear.

In constructing a rock-drill in accordance with these improvements anddescribing, preferably, but one type a cylinder portion t is provided,having a head portion formedin two parts o and c-at one end. Areciprocating piston (l is provided and movably mount- 6':

ed in the cylinder portion, so as to be reciprocated as steam, air, orother motive fluid is admitted and exhausted alternately to and fromeach end of -the cylinder. This piston portion is provided with a stemportion c, extending out of one end of the cylinder, to which the drillproper may besecured in any usnalvand well-known manner, preferably asshown inconnection with myformer applicaf tion above referred to, andwhich therefore needs no rfurther description or'illustration herein. Itis veryv desirable during the reciprocating movements ofthis piston torotate it in a step-by-step manner in one direction, andpreferably asthe piston is being moved backwardly to theright, as shown in Fig. 1. Inorder to accomplish this result, the piston portion is provided with arified nut f, secured in threaded engagement therewith, as shownparticularly in Fig. 1. A reciprocating rifled 30 bar g is provided andengages with the rified bore of the nut, asshown in such figure. One endof the rifled bar is provided with a faceratchet ZL, havingratchet-teeth of a saw-tooth shape, as shown particularly in Fig. 1. Asecond face-ratchet t' is provided and frictionally held in position inthe cylinder-head portion c by having its stem portion j mounted thereinand held against a fibrous'frictionwasher 7c by means of a nut Z. Aplurality of 90 helically-coiled springs m is inserted in thecylinder-head and pressed againstthe smooth face of ratchet It, so as tohold it yieldingly in engagement with the second ratchet. An examinationof Fig. -1 will show that the stem 95 portion of the frictionally-heldratchet extends through the head of the cylinder and is exposed to View,so that it provides for two things-rst, a simple and economical meansfor frictionally holding the second ratchet in position, and, second,the immediate detection by the operator of any rotary movement. Thelatter is extremely important in that it enables the operator to securethe frictionallyheld ratchet in position with just the required amountof friction to make it non-rotatable, while at the same time providingfor immediate detection of any rotation thereof, all of which willbe'understood by those skilled in the art.

In operation during the forward movement of the piston the rlied nutcarries the rilied bar forward for a short distance of its motion andduring the remainder of its motion turns the rifled bar, with itsface-ratchet, to the left against the turning of the hands of a clock,the helical springs normally holding its ratchet under tension. Duringthe rearward movement of the piston the riiied bar is moved backwardlyand the tendency is to turn the same to the right in the direction ofthe hands of a clock. The ratchet mechanism, however, prevents such aturning movement of the rifled bar, the consequence being that thepiston, with its drill, is turned in the opposite direction and rotatedin a step-by-step manner during its reciprocating cycle and while thepiston is retreating.

I claim# 1. In a rock-drill of the class described, the combination of acylinder portion, a reciprocating piston movably mounted therein, a riednut in engagement with said pistonhead, a riiedbar in engagement withsaid nut and-provided with a radially-arranged faceratchet at its outerend, a second radially-arranged face-ratchet frictionally held in thecylinder-head, a stem portion therefor extending through thecylinder-head and provided with a threaded end portion, a threaded nuton the threaded end of said stem portion, a yielding washer insertedbetween the second ratchet and the cylinder-head to hold the same infrictional engagement with said cylinder-head,and spring mechanismengaging the first-named ratchet, so as to normally hold it and therebythe rifled bar in engagement with the second ratchet, substantially asdescribed.

.2. In a rock-drill of the class described, the combination of acylinder portion, a piston reciprocatingly mounted therein, a riiied nutin said piston, a reciprocating ricd bar in engagement with said nut andprovided with a radially-arranged face-ratchet at its outer end, and asecond face-ratchet secured to the frame of the machine and adapted tobe alternately thrown into and'out of engagement with the ratchet of theriiied bar as the same is reciprocated, substantially as described.

3. In a rock-drill of the class described, the combination of a cylinderportion, a piston reciprocatingly mounted therein, a rifled nut in saidpiston, a rifled bar in engagement therewith and provided with ratchetmechanism at its outer end, a second ratchet frictionally secured to theframe of the machine and provided with an exposed part or portion bywhich any movement thereof may be detected, substantially as described.

4. In a rock-drill of the class described, the combination of a cylinderportion, a piston reciprocatingly mounted therein, a rifled nut insaidpiston, a riiied bar in engagement with said nut and provided with aradially-arranged face-ratchet, and a second ratchet frictionallysecured to the head of the machine in engagement with the first-namedratchet to rotate the same and thereby the piston in a step-by-stepmanner and provided with exposed holding mechanism extending through theframe of the machine by which it is frictionally held in place and anymovement thereof detected,substantially as described.

ROBERT TEMPLE.

Witnesses:

THOMAS F. SHERIDAN, HARRY I. H. CROMER.

